86 lines
1.7 KiB
C
86 lines
1.7 KiB
C
#if defined (__x86_64__) || defined (__i386__)
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#include <stdint.h>
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#include <sys/gdt.h>
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#include <mm/pmm.h>
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#include <lib/libc.h>
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static struct gdt_desc gdt_descs[] = {
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{0},
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{
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.limit = 0xffff,
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.base_low = 0x0000,
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.base_mid = 0x00,
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.access = 0b10011010,
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.granularity = 0b00000000,
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.base_hi = 0x00
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},
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{
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.limit = 0xffff,
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.base_low = 0x0000,
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.base_mid = 0x00,
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.access = 0b10010010,
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.granularity = 0b00000000,
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.base_hi = 0x00
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},
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{
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.limit = 0xffff,
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.base_low = 0x0000,
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.base_mid = 0x00,
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.access = 0b10011010,
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.granularity = 0b11001111,
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.base_hi = 0x00
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},
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{
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.limit = 0xffff,
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.base_low = 0x0000,
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.base_mid = 0x00,
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.access = 0b10010010,
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.granularity = 0b11001111,
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.base_hi = 0x00
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},
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{
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.limit = 0x0000,
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.base_low = 0x0000,
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.base_mid = 0x00,
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.access = 0b10011010,
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.granularity = 0b00100000,
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.base_hi = 0x00
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},
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{
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.limit = 0x0000,
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.base_low = 0x0000,
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.base_mid = 0x00,
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.access = 0b10010010,
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.granularity = 0b00000000,
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.base_hi = 0x00
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}
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};
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#if defined (BIOS)
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__attribute__((section(".realmode")))
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#endif
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struct gdtr gdt = {
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sizeof(gdt_descs) - 1,
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(uintptr_t)gdt_descs,
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#if defined (__i386__)
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0
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#endif
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};
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#if defined (UEFI)
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void init_gdt(void) {
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struct gdt_desc *gdt_copy = ext_mem_alloc(sizeof(gdt_descs));
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memcpy(gdt_copy, gdt_descs, sizeof(gdt_descs));
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gdt.ptr = (uintptr_t)gdt_copy;
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}
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#endif
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#endif
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